Update README.md

README.md

@@ -7,10 +7,20 @@
 
 * Cardboard
 * Paper
-* Polypropylene
+* <a href='http://www.itwformex.com/'Polypropylene</a>
+* <a href='https://www.mcmaster.com/#standard-plastic-sheets/=1a6mf16'>Dibond</a>
 * Steel
-* Stainless
-* Aluminum: Must be a formable series, like 1100 or 3003.  <a href='https://www.onlinemetals.com/merchant.cfm?id=753&step=2&top_cat=60'>Online Metals</a>
+* Stainless Steel
+* Aluminum: Must be a formable series, like 1100 or <a href='https://www.onlinemetals.com/merchant.cfm?id=753&step=2&top_cat=60'>3003</a>
+
+### Creasing Methods
+
+* Press Brake
+* Finger Brake
+* Vice Bending
+* Perforating
+* Half-cutting
+* Bevel routing
 
 
 ### Design tools